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为了制备定向生长、光电性能优越的ZnO纳米阵列,改进了一种较为简单的水热方法:首先在ITO玻璃上铺上一层岛状ZnO种子,然后利用水热反应,在ITO玻璃上生长了规则排列的、沿(002)晶轴定向生长的ZnO纳米阵列.并基于XRD、SEM、光致发光光谱等测试揭示了样品的形貌、微结构和发光性能的特征及相互作用机理.分析结果表明,纳米线属于六方纤锌矿结构,具有垂直沿c轴方向择优生长的特征.光致发光光谱测试表明,当ZnO纳米线阵列的取向性较差时,可同时观测到较强的绿光发射和蓝光发射;但是,当ZnO纳米线阵列的取向性明显提高之后,只发射单一的强绿光.进一步分析表明,随着前驱溶液浓度的降低,ZnO纳米线阵列的发光强度呈非线性变化,而纳米线的尺寸单调的变小.
In order to prepare ZnO nanowire array with excellent optical and electrical properties, a simpler hydrothermal method is improved. First, a layer of island-shaped ZnO seeds is coated on ITO glass and then hydrothermally grown on ITO glass Oriented ZnO nanowire arrays grown along the (002) crystal axis, and the morphologies, microstructures and luminescence properties of the samples were revealed based on the XRD, SEM and photoluminescence spectra.The results of the analysis The results show that the nanowires belong to the hexagonal wurtzite structure and have the characteristics of preferentially growing vertically along the c-axis.The photoluminescence spectra show that when the orientation of the ZnO nanowire arrays is poor, the strong green light Emission and blue emission, but only a single strong green light was emitted when the orientation of the ZnO nanowire arrays was significantly improved.A further analysis showed that the luminescence intensity of the ZnO nanowire arrays changed nonlinearly with the decrease of the concentration of the precursor solution , While the size of the nanowire becomes monotonous.